5 задание
1. might have been
2. may be
3. much have been
4. must be
5. can't have been
6. can't be
6 задание
1. could be
2. must have been
3. isn't
4. might have escaped
5. is
6. might have seen
7 задание
1. a
2. b
3. a
4. a
5. c
6. c
7. a
8. c
